# Claude Sonnet 4.6

Claude Sonnet 4.6 is an Anthropic language model released Feb 17, 2026; Anthropic's newest language model in our dataset is Claude Haiku 5.5. Proprietary, API access only. Anthropic's Claude Sonnet 4.6, launched Feb 17, 2026, the predecessor of Claude Sonnet 5; a 1M-token context was offered in beta. Verified against vendor sources on Oct 26, 2026.

Last verified: 2026-10-26 · Evidence: Reported · Canonical: https://theagenticweekly.com/models/claude-sonnet-4-6 · JSON: https://theagenticweekly.com/api/models/claude-sonnet-4-6

## Key facts

| Fact | Value | Source |
|---|---|---|
| Vendor | Anthropic |  |
| Released | Feb 17, 2026 | https://platform.claude.com/docs/en/release-notes/overview |
| API id | `claude-sonnet-4-6` | https://platform.claude.com/docs/en/release-notes/overview |
| Licence | Proprietary (API) | https://platform.claude.com/docs/en/about-claude/models/overview |

## What we tested

Nothing yet. We have not run Claude Sonnet 4.6 ourselves, so every fact here is Reported from the sources below.

## Not verified, left out

- The 1M-token context window is described as beta in the release notes, so no standard context value is recorded.
- Price and max output were not captured for this model.

## Sources

- [Claude Platform release notes](https://platform.claude.com/docs/en/release-notes/overview)
- [Anthropic models overview](https://platform.claude.com/docs/en/about-claude/models/overview)

Data licence: CC BY 4.0. Data: Agentic Weekly (https://theagenticweekly.com), CC BY 4.0.